(adsbygoogle = window.adsbygoogle || []).push({}); Right Trapezium - Simple Problem Using Trigonometry

1. The problem statement, all variables and given/known data

http://img207.imageshack.us/img207/8510/imagejat.jpg [Broken]

ABCD is a right trapezium. CB = 3 = CD. P is a point of CB. The angle CDP is called x.

I have to express the function

f(x) = DP + CP

and I have to find the interval in which the function can be considered.

2. Relevant equations

3. The attempt at a solution

I've found the function:

http://img836.imageshack.us/img836/848/imageuox.jpg [Broken]

But I can't understand how I can find the interval.

Thank you very much for helping!

PS: the solution on my book is 0<=x<=30º.

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# Homework Help: Express a function - Trigonometic Problem

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